Patent US3179689A successfully refreshed from Google Patents.
Patent EP0361729A2 successfully refreshed from Google Patents.
EP0361729A2
Expired / Lapsed
EP
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Sensor and measurement process utilizing a surface transverse wave device
Assignee: HP Inc
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Filing: 1989-09-11
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Granted: —
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Expires: 2009-09-11
Abstract
Abstract A sensor (11, 12, 13, 15) suitable for use as a viscosity sensor, a chemically selective sensor, or a chemically specific sensor comprises a surface transverse wave (STW) device that, for solute concentration measurements, includes a binding layer (18) selected bind to the solute to be measured. This binding layer (18) can be antibody so that the sensor detects a particular antigen.
Inventors
- 👤 Richard L. Baer
- 👤 Carl Myerholtz
- 👤 Curt Flory
- 👤 May Tom-Moy
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 05:34
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/02; G01N29/022; G01N2291/00; G01N2291/02; G01N2291/025; G01N2291/0256; G01N2291/028; G01N2291/02809; G01N2291/02818; G01N2291/02845; G01N2291/04; G01N2291/042; G01N2291/0422; Y; Y10; Y10S; Y10S73/00; Y10S73/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
52 words
A method of measuring properties of a liquid, said method comprising the steps of: (a) immersing (61) a surface transverse wave device in said liquid, said device having an input and an output; (b) applying (62) an input signal to said input; and (c) detecting (63) an output signal at said output.
Claim 2
Independent Claim
52 words
A method of measuring properties of a liquid, said method comprising the steps of: (a) immersing (61) a surface transverse wave device in said liquid, said device having an input and an output; (b) applying (62) an input signal to said input; and (c) detecting (63) an output signal at said output.
Claim 3
Dependent Claim
44 words
A method as in claim 1 wherein step (a) comprises immersing in said liquid a surface transverse wave having no binding layer, said method further comprising the step of: (d1) calculating (64) the viscosity of the fluid as a function of the output signal.
Claim 4
Dependent Claim
66 words
A method as in claim 1, wherein step (a) comprises immersing in said liquid a surface transverse wave device having a surface coated with a layer that selectively adheres to a preselected class of solutes that is soluble in said liquid, said method further comprising the step of: (d2) calculating (64) the concentration of said preselected class of solutes as a function of the output signal.
Claim 5
Dependent Claim
56 words
A method as in claim 3, wherein step (a) comprises immersing in said liquid a surface transverse wave device having a surface coated with a binding layer selected from the group consisting of an antigen and its associated antibody, whereby in step (d2) the calculated concentration is the concentration of the other substance in this group.
Claim 6
Dependent Claim
69 words
A method as in claim 3, wherein step (a) comprises immersing in said liquid a surface transverse wave device having a surface coated with a binding layer consisting essentially of identical molecules that are each a fragment of one strand of a nucleic acid, whereby in step (d2) the calculated concentration is the concentration of a nucleic strand fragment that is complementary to the fragment in the binding layer.
Claim 7
Independent Claim
74 words
A method as in any of claims 2 to 5 further comprising before step (d) the steps of immersing (61′) said surface transverse wave device in a reference fluid; applying (62′) an input signal to said input; and detecting (63′) an output signal at said output to measure the output signal while immersed in said reference fluid; and wherein the calculation in step (d) utilizes both of these measured values of the output signal.
Claim 8
Dependent Claim
83 words
A surface transverse wave device suitable for use as a sensor in liquids, and comprising a piezoelectric substrate (11) having a top surface (14), and at least one transducer (12) on said top surface (14), characterised in that it further comprises a shielding layer (17) covering said at least one transducer, said shielding layer having sufficient thickness to substantially eliminate shorting of said transducer by said liquids, and means for trapping acoustic waves in the substrate at the top surface of said substrate.
Claim 9
Dependent Claim
83 words
A surface transverse wave device suitable for use as a sensor in liquids, and comprising a piezoelectric substrate (11) having a top surface (14), and at least one transducer (12) on said top surface (14), characterised in that it further comprises a shielding layer (17) covering said at least one transducer, said shielding layer having sufficient thickness to substantially eliminate shorting of said transducer by said liquids, and means for trapping acoustic waves in the substrate at the top surface of said substrate.
Claim 10
Dependent Claim
36 words
A device as in claim 7 wherein the transducer has a plurality of parallel elements separated by a spacing S₁ and said shielding layer has a thickness at least on the order of a spacing S₁.
Claim 11
Dependent Claim
31 words
A device as in claim 7 or 8 further comprising on said top surface a binding layer (18) that binds to a class of solutes to be detected in said liquid.
Claim 12
Dependent Claim
40 words
A device as in claim 9 wherein said binding layer (18) is chemically selective for a selected class of chemicals, whereby said device is a chemical sensor that can measure the concentration of said selected class in said liquid sample.
Claim 13
Dependent Claim
38 words
A device as in claim 9 wherein said binding layer (18) is chemically specific for a single chemical, whereby said device is a chemical sensor that can measure the concentration of said single chemical in said liquid sample.
Claim 14
Independent Claim
34 words
A device as in any of claims 7 to 11, having a length L that is optimized to equal the inverse of the amplitude attenuation factor (in nepers/meter) in order to maximize the sensitivity.
References Cited (Backward Citations)
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